gio/glocalfileenumerator.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: Alexander Larsson <alexl@redhat.com>
  21  */
  22
  23 #include "config.h"
  24
  25 #include <glib.h>
  26 #include <glocalfileenumerator.h>
  27 #include <glocalfileinfo.h>
  28 #include <glocalfile.h>
  29 #include <gioerror.h>
  30 #include <string.h>
  31 #include <stdlib.h>
  32 #include "glibintl.h"
  33
  34 #include "gioalias.h"
  35
  36 #define CHUNK_SIZE 1000
  37
  38   /* TODO:
  39    *  It would be nice to use the dirent->d_type to check file type without
  40    *  needing to stat each files on linux and other systems that support it.
  41    *  (question: does that following symlink or not?)
  42    */
  43
  44 #ifdef G_OS_WIN32
  45 #define USE_GDIR
  46 #endif
  47
  48 #ifndef USE_GDIR
  49
  50 #include <sys/types.h>
  51 #include <dirent.h>
  52 #include <errno.h>
  53
  54 typedef struct {
  55   char *name;
  56   long inode;
  57 } DirEntry;
  58
  59 #endif
  60
  61 struct _GLocalFileEnumerator
  62 {
  63   GFileEnumerator parent;
  64
  65   GFileAttributeMatcher *matcher;
  66   char *filename;
  67   char *attributes;
  68   GFileQueryInfoFlags flags;
  69
  70   gboolean got_parent_info;
  71   GLocalParentFileInfo parent_info;
  72
  73 #ifdef USE_GDIR
  74   GDir *dir;
  75 #else
  76   DIR *dir;
  77   DirEntry *entries;
  78   int entries_pos;
  79   gboolean at_end;
  80 #endif
  81
  82   gboolean follow_symlinks;
  83 };
  84
  85 #define g_local_file_enumerator_get_type _g_local_file_enumerator_get_type
  86 G_DEFINE_TYPE (GLocalFileEnumerator, g_local_file_enumerator, G_TYPE_FILE_ENUMERATOR);
  87
  88 static GFileInfo *g_local_file_enumerator_next_file (GFileEnumerator  *enumerator,
  89                                                      GCancellable     *cancellable,
  90                                                      GError          **error);
  91 static gboolean   g_local_file_enumerator_close     (GFileEnumerator  *enumerator,
  92                                                      GCancellable     *cancellable,
  93                                                      GError          **error);
  94
  95
  96 static void
  97 free_entries (GLocalFileEnumerator *local)
  98 {
  99 #ifndef USE_GDIR
 100   int i;
 101
 102   if (local->entries != NULL)
 103     {
 104       for (i = 0; local->entries[i].name != NULL; i++)
 105         g_free (local->entries[i].name);
 106
 107       g_free (local->entries);
 108     }
 109 #endif
 110 }
 111
 112 static void
 113 g_local_file_enumerator_finalize (GObject *object)
 114 {
 115   GLocalFileEnumerator *local;
 116
 117   local = G_LOCAL_FILE_ENUMERATOR (object);
 118
 119   g_free (local->filename);
 120   g_file_attribute_matcher_unref (local->matcher);
 121   if (local->dir)
 122     {
 123 #ifdef USE_GDIR
 124       g_dir_close (local->dir);
 125 #else
 126       closedir (local->dir);
 127 #endif
 128       local->dir = NULL;
 129     }
 130
 131   free_entries (local);
 132
 133   G_OBJECT_CLASS (g_local_file_enumerator_parent_class)->finalize (object);
 134 }
 135
 136
 137 static void
 138 g_local_file_enumerator_class_init (GLocalFileEnumeratorClass *klass)
 139 {
 140   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 141   GFileEnumeratorClass *enumerator_class = G_FILE_ENUMERATOR_CLASS (klass);
 142
 143   gobject_class->finalize = g_local_file_enumerator_finalize;
 144
 145   enumerator_class->next_file = g_local_file_enumerator_next_file;
 146   enumerator_class->close_fn = g_local_file_enumerator_close;
 147 }
 148
 149 static void
 150 g_local_file_enumerator_init (GLocalFileEnumerator *local)
 151 {
 152 }
 153
 154 #ifdef USE_GDIR
 155 static void
 156 convert_file_to_io_error (GError **error,
 157                           GError  *file_error)
 158 {
 159   int new_code;
 160
 161   if (file_error == NULL)
 162     return;
 163
 164   new_code = G_IO_ERROR_FAILED;
 165
 166   if (file_error->domain == G_FILE_ERROR)
 167     {
 168       switch (file_error->code)
 169         {
 170         case G_FILE_ERROR_NOENT:
 171           new_code = G_IO_ERROR_NOT_FOUND;
 172           break;
 173         case G_FILE_ERROR_ACCES:
 174           new_code = G_IO_ERROR_PERMISSION_DENIED;
 175           break;
 176         case G_FILE_ERROR_NOTDIR:
 177           new_code = G_IO_ERROR_NOT_DIRECTORY;
 178           break;
 179         default:
 180           break;
 181         }
 182     }
 183
 184   g_set_error_literal (error, G_IO_ERROR,
 185                        new_code,
 186                        file_error->message);
 187 }
 188 #endif
 189
 190 GFileEnumerator *
 191 _g_local_file_enumerator_new (GLocalFile *file,
 192                               const char           *attributes,
 193                               GFileQueryInfoFlags   flags,
 194                               GCancellable         *cancellable,
 195                               GError              **error)
 196 {
 197   GLocalFileEnumerator *local;
 198   char *filename = g_file_get_path (G_FILE (file));
 199
 200 #ifdef USE_GDIR
 201   GError *dir_error;
 202   GDir *dir;
 203
 204   dir_error = NULL;
 205   dir = g_dir_open (filename, 0, error != NULL ? &dir_error : NULL);
 206   if (dir == NULL)
 207     {
 208       if (error != NULL)
 209         {
 210           convert_file_to_io_error (error, dir_error);
 211           g_error_free (dir_error);
 212         }
 213       g_free (filename);
 214       return NULL;
 215     }
 216 #else
 217   DIR *dir;
 218   int errsv;
 219
 220   dir = opendir (filename);
 221   if (dir == NULL)
 222     {
 223       errsv = errno;
 224
 225       g_set_error_literal (error, G_IO_ERROR,
 226                            g_io_error_from_errno (errsv),
 227                            g_strerror (errsv));
 228       g_free (filename);
 229       return NULL;
 230     }
 231
 232 #endif
 233
 234   local = g_object_new (G_TYPE_LOCAL_FILE_ENUMERATOR,
 235                         "container", file,
 236                         NULL);
 237
 238   local->dir = dir;
 239   local->filename = filename;
 240   local->matcher = g_file_attribute_matcher_new (attributes);
 241   local->flags = flags;
 242
 243   return G_FILE_ENUMERATOR (local);
 244 }
 245
 246 #ifndef USE_GDIR
 247 static int
 248 sort_by_inode (const void *_a, const void *_b)
 249 {
 250   const DirEntry *a, *b;
 251
 252   a = _a;
 253   b = _b;
 254   return a->inode - b->inode;
 255 }
 256
 257 static const char *
 258 next_file_helper (GLocalFileEnumerator *local)
 259 {
 260   struct dirent *entry;
 261   const char *filename;
 262   int i;
 263
 264   if (local->at_end)
 265     return NULL;
 266
 267   if (local->entries == NULL ||
 268       (local->entries[local->entries_pos].name == NULL))
 269     {
 270       if (local->entries == NULL)
 271         local->entries = g_new (DirEntry, CHUNK_SIZE + 1);
 272       else
 273         {
 274           /* Restart by clearing old names */
 275           for (i = 0; local->entries[i].name != NULL; i++)
 276             g_free (local->entries[i].name);
 277         }
 278
 279       for (i = 0; i < CHUNK_SIZE; i++)
 280         {
 281           entry = readdir (local->dir);
 282           while (entry
 283                  && (0 == strcmp (entry->d_name, ".") ||
 284                      0 == strcmp (entry->d_name, "..")))
 285             entry = readdir (local->dir);
 286
 287           if (entry)
 288             {
 289               local->entries[i].name = g_strdup (entry->d_name);
 290               local->entries[i].inode = entry->d_ino;
 291             }
 292           else
 293             break;
 294         }
 295       local->entries[i].name = NULL;
 296       local->entries_pos = 0;
 297
 298       qsort (local->entries, i, sizeof (DirEntry), sort_by_inode);
 299     }
 300
 301   filename = local->entries[local->entries_pos++].name;
 302   if (filename == NULL)
 303     local->at_end = TRUE;
 304
 305   return filename;
 306 }
 307
 308 #endif
 309
 310 static GFileInfo *
 311 g_local_file_enumerator_next_file (GFileEnumerator  *enumerator,
 312                                    GCancellable     *cancellable,
 313                                    GError          **error)
 314 {
 315   GLocalFileEnumerator *local = G_LOCAL_FILE_ENUMERATOR (enumerator);
 316   const char *filename;
 317   char *path;
 318   GFileInfo *info;
 319   GError *my_error;
 320
 321   if (!local->got_parent_info)
 322     {
 323       _g_local_file_info_get_parent_info (local->filename, local->matcher, &local->parent_info);
 324       local->got_parent_info = TRUE;
 325     }
 326
 327  next_file:
 328
 329 #ifdef USE_GDIR
 330   filename = g_dir_read_name (local->dir);
 331 #else
 332   filename = next_file_helper (local);
 333 #endif
 334
 335   if (filename == NULL)
 336     return NULL;
 337
 338   my_error = NULL;
 339   path = g_build_filename (local->filename, filename, NULL);
 340   info = _g_local_file_info_get (filename, path,
 341                                  local->matcher,
 342                                  local->flags,
 343                                  &local->parent_info,
 344                                  &my_error);
 345   g_free (path);
 346
 347   if (info == NULL)
 348     {
 349       /* Failed to get info */
 350       /* If the file does not exist there might have been a race where
 351        * the file was removed between the readdir and the stat, so we
 352        * ignore the file. */
 353       if (my_error->domain == G_IO_ERROR &&
 354           my_error->code == G_IO_ERROR_NOT_FOUND)
 355         {
 356           g_error_free (my_error);
 357           goto next_file;
 358         }
 359       else
 360         g_propagate_error (error, my_error);
 361     }
 362
 363   return info;
 364 }
 365
 366 static gboolean
 367 g_local_file_enumerator_close (GFileEnumerator  *enumerator,
 368                                GCancellable     *cancellable,
 369                                GError          **error)
 370 {
 371   GLocalFileEnumerator *local = G_LOCAL_FILE_ENUMERATOR (enumerator);
 372
 373   if (local->dir)
 374     {
 375 #ifdef USE_GDIR
 376       g_dir_close (local->dir);
 377 #else
 378       closedir (local->dir);
 379 #endif
 380       local->dir = NULL;
 381     }
 382
 383   return TRUE;
 384 }
 385
 386